US20100003131A1 - Axial fan - Google Patents
Axial fan Download PDFInfo
- Publication number
- US20100003131A1 US20100003131A1 US12/238,443 US23844308A US2010003131A1 US 20100003131 A1 US20100003131 A1 US 20100003131A1 US 23844308 A US23844308 A US 23844308A US 2010003131 A1 US2010003131 A1 US 2010003131A1
- Authority
- US
- United States
- Prior art keywords
- rotary blades
- annular wall
- base
- axial fan
- central tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
- F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
Definitions
- the disclosure relates to an axial fan, and more particularly to an axial fan providing increased airflow and reduced operating noise.
- CPUs central processing units
- Axial fans are commonly used in combination with heat sinks for cooling CPUs.
- an axial fan includes a stator and a rotor.
- the rotor includes a hub and a plurality of fan blades extending outwardly therefrom.
- a permanent magnet is arranged in the hub and surrounds the stator.
- the stator includes a stator core with coils wound therearound. When electrical current is supplied to the coils, the fan blades, rotated by magnetic force of the coils, produce forced airflow.
- a fan housing surrounding the stator and the rotor guides the forced airflow from one side to an opposite side.
- the housing is stationary, and a gap is defined between the outer ends of the blades and the housing to avoid friction therebetween. Accordingly, size of the fan blades is limited, which correspondingly limits airflow.
- airflow from the rotary fan blades impacts the stationary fan housing, increasing noise of the axial fan.
- an axial fan defines an air inlet on one side and an air outlet on an opposite side along an axis of the fan.
- the axial fan includes a base, a bearing, a stator and a rotor.
- a central tube extends upwardly from the base, around which the stator is mounted.
- the bearing is received in the central tube of the base and the rotor is rotatably supported by the bearing.
- the rotor includes a hub, a plurality of rotary blades extending outwardly from the hub, and an annular wall surrounding the rotary blades. The annular wall connects to outer ends of the rotary blades and rotates therewith, guiding airflow from the air inlet to the air outlet during operation of the fan.
- FIG. 1 is an assembled view of an axial fan according to an exemplary embodiment.
- FIG. 2 is an exploded view of the axial fan of FIG. 1 .
- FIG. 3 shows a rotor of the axial fan of FIG. 1 , viewed from a bottom aspect thereof.
- FIG. 4 shows an alternative embodiment of the axial fan.
- FIG. 1 shows an axial fan according to an exemplary embodiment.
- the axial fan is configured for producing forced airflow.
- a top side of the axial fan forms an air inlet 15 feeding airflow into the axial fan, and a bottom side of the axial fan forms an air outlet 17 exhausting airflow out the axial fan.
- the axial fan includes a base 10 , a stator 20 , and a rotor 30 .
- the base 10 is substantially circular.
- Four ribs 14 extend outwardly along a tangential direction of the base 10 .
- the ribs 14 are evenly arranged along a circumferential direction of the base 10 .
- a fixing portion 16 is formed at a free end of each rib 14 .
- the fixing portion 16 is a cylinder extending upwardly from the free end of the rib 14 , acting as a fixing member for fastening devices, such as a screw, to extend therethrough to fix the axial fan to other devices, such as a heat sink.
- a central tube 12 extends upwardly from a center of the base 10 .
- a central hole 122 is defined in the central tube 12 receiving a bearing 100 therein.
- the stator 20 is mounted around the central tube 12 .
- the stator 20 includes a stator core 22 with coils 24 wound thereon to establish an alternating magnetic field, and a PCB 26 (printed circuit board) with electronic components mounted thereon.
- the electronic components are electrically connected with the coils 24 to control electrical current flowing through the coils 24 .
- a pair of insulating frames 28 cover the stator core 22 .
- the rotor 30 includes a hub 32 forming a shaft seat 320 at a central portion thereof, a shaft 33 extending downwardly from the shaft seat 320 of the rotor 30 , a magnet 34 adhered to an inner surface of the hub 32 , a plurality of rotary blades 36 extending radially and outwardly from an outer periphery of the hub 32 , and an annular wall 38 surrounding the rotary blades 36 .
- the annular wall 38 connects to outer ends 364 of the rotary blades 36 and rotates therewith during rotation of the rotor 30 . Height of the annular wall 38 along an axis of the rotor 30 is approximately the same as that of the rotary blades 36 .
- a top side 380 of the annular wall 38 is approximately at the same level as an end 360 of each rotary blade 36 adjacent to the air inlet 15 of the axial fan, and a bottom side 382 of the annular wall 38 is approximately at the same level as a distal end 362 of the blade adjacent to the air outlet 17 of the axial fan.
- the stator 20 is fixed to the central tube 12 .
- the shaft 33 of the rotor 30 extends into the bearing 100 and thus is rotatably supported thereby.
- the hub 32 of the rotor 30 surrounds the stator 20 with the magnet 34 confronting the coils 24 of the stator 20 .
- the annular wall 38 of the rotor 30 is located among the four fixed portions 16 .
- An outer surface of the annular wall 38 is spaced from the fixing portions 16 , and the bottom side 382 of the annular wall 38 is higher than the base 10 .
- the rotor 30 is rotated by the interaction of the alternating magnetic field established by the stator 20 and the magnetic field of the magnet 34 of the rotor 30 .
- the rotary blades 36 thus produce forced airflow.
- the annular wall 38 surrounding the rotary blades 36 guides the forced airflow from the air inlet 15 to the air outlet 17 .
- the annular wall 38 is connected to the outer ends 364 of the rotary blades 36 and rotates with the rotary blades 36 , increasing a sturdiness of the axial fan, such that operating noise of the axial fan is reduced.
- length of the rotary blade 36 along the extending direction increases, increasing airflow generated by the axial fan and correspondingly providing improved heat dissipation.
- FIG. 4 shows an alternative embodiment of the axial fan, differing from the previous embodiment in that a frame 48 is arranged around the base 42 .
- the frame 48 is square, with an opening 43 defined in the frame 48 for airflow flowing therethrough.
- the base 42 is arranged at a center of the opening 43 .
- Four fixing portions 46 extend from the four corners of the frame 48 , respectively, for fixing the axial fan to a heat sink for example.
- Three ribs 44 extend from an outer periphery to an inner periphery of the frame 48 , along a tangential direction and evenly arranged along the circumferential direction of the base 42 .
- a guiding portion 581 extends outwardly and upwardly from a top side 582 of the annular wall 58 .
- a top edge 583 of the guiding portion 581 is higher than the end 560 of the rotary blade 56 , and a bottom side 580 of the annular wall 58 is substantially at the same level as the distal end 562 of the blade 56 .
- the guiding portion 581 has a diameter gradually decreasing along the path of the airflow, concentrating the airflow onto the rotor 50 , and increasing speed thereof accordingly.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- 1. Field of the Disclosure
- The disclosure relates to an axial fan, and more particularly to an axial fan providing increased airflow and reduced operating noise.
- 2. Description of Related Art
- With continuing developments in technology, electronic packages such as CPUs (central processing units) generating more heat that requires immediate dissipation. Axial fans are commonly used in combination with heat sinks for cooling CPUs.
- Often, an axial fan includes a stator and a rotor. The rotor includes a hub and a plurality of fan blades extending outwardly therefrom. A permanent magnet is arranged in the hub and surrounds the stator. The stator includes a stator core with coils wound therearound. When electrical current is supplied to the coils, the fan blades, rotated by magnetic force of the coils, produce forced airflow. A fan housing surrounding the stator and the rotor guides the forced airflow from one side to an opposite side. However, during operation, while the fan blades rotate, the housing is stationary, and a gap is defined between the outer ends of the blades and the housing to avoid friction therebetween. Accordingly, size of the fan blades is limited, which correspondingly limits airflow. In addition, airflow from the rotary fan blades impacts the stationary fan housing, increasing noise of the axial fan.
- For the foregoing reasons, there is a need in the art for an axial fan which overcomes the described limitations.
- According to an exemplary embodiment of the disclosure, an axial fan defines an air inlet on one side and an air outlet on an opposite side along an axis of the fan. The axial fan includes a base, a bearing, a stator and a rotor. A central tube extends upwardly from the base, around which the stator is mounted. The bearing is received in the central tube of the base and the rotor is rotatably supported by the bearing. The rotor includes a hub, a plurality of rotary blades extending outwardly from the hub, and an annular wall surrounding the rotary blades. The annular wall connects to outer ends of the rotary blades and rotates therewith, guiding airflow from the air inlet to the air outlet during operation of the fan.
- Other advantages and novel features of the disclosure will be drawn from the following detailed description of the exemplary embodiments of the disclosure with attached drawings.
-
FIG. 1 is an assembled view of an axial fan according to an exemplary embodiment. -
FIG. 2 is an exploded view of the axial fan ofFIG. 1 . -
FIG. 3 shows a rotor of the axial fan ofFIG. 1 , viewed from a bottom aspect thereof. -
FIG. 4 shows an alternative embodiment of the axial fan. -
FIG. 1 shows an axial fan according to an exemplary embodiment. The axial fan is configured for producing forced airflow. A top side of the axial fan forms anair inlet 15 feeding airflow into the axial fan, and a bottom side of the axial fan forms anair outlet 17 exhausting airflow out the axial fan. - Referring to
FIG. 2 , the axial fan includes abase 10, astator 20, and arotor 30. Thebase 10 is substantially circular. Fourribs 14 extend outwardly along a tangential direction of thebase 10. Theribs 14 are evenly arranged along a circumferential direction of thebase 10. Afixing portion 16 is formed at a free end of eachrib 14. In this embodiment, thefixing portion 16 is a cylinder extending upwardly from the free end of therib 14, acting as a fixing member for fastening devices, such as a screw, to extend therethrough to fix the axial fan to other devices, such as a heat sink. Acentral tube 12 extends upwardly from a center of thebase 10. Acentral hole 122 is defined in thecentral tube 12 receiving abearing 100 therein. - The
stator 20 is mounted around thecentral tube 12. Thestator 20 includes astator core 22 withcoils 24 wound thereon to establish an alternating magnetic field, and a PCB 26 (printed circuit board) with electronic components mounted thereon. The electronic components are electrically connected with thecoils 24 to control electrical current flowing through thecoils 24. To prevent thecoils 24 from making electrical contact with thestator core 22, a pair ofinsulating frames 28 cover thestator core 22. - Referring to
FIG. 3 , therotor 30 includes ahub 32 forming ashaft seat 320 at a central portion thereof, ashaft 33 extending downwardly from theshaft seat 320 of therotor 30, amagnet 34 adhered to an inner surface of thehub 32, a plurality ofrotary blades 36 extending radially and outwardly from an outer periphery of thehub 32, and anannular wall 38 surrounding therotary blades 36. Theannular wall 38 connects toouter ends 364 of therotary blades 36 and rotates therewith during rotation of therotor 30. Height of theannular wall 38 along an axis of therotor 30 is approximately the same as that of therotary blades 36. Atop side 380 of theannular wall 38 is approximately at the same level as anend 360 of eachrotary blade 36 adjacent to theair inlet 15 of the axial fan, and abottom side 382 of theannular wall 38 is approximately at the same level as adistal end 362 of the blade adjacent to theair outlet 17 of the axial fan. - After assembly, the
stator 20 is fixed to thecentral tube 12. Theshaft 33 of therotor 30 extends into thebearing 100 and thus is rotatably supported thereby. Thehub 32 of therotor 30 surrounds thestator 20 with themagnet 34 confronting thecoils 24 of thestator 20. Theannular wall 38 of therotor 30 is located among the four fixedportions 16. An outer surface of theannular wall 38 is spaced from thefixing portions 16, and thebottom side 382 of theannular wall 38 is higher than thebase 10. - During operation, the
rotor 30 is rotated by the interaction of the alternating magnetic field established by thestator 20 and the magnetic field of themagnet 34 of therotor 30. Therotary blades 36 thus produce forced airflow. Theannular wall 38 surrounding therotary blades 36 guides the forced airflow from theair inlet 15 to theair outlet 17. Furthermore, theannular wall 38 is connected to theouter ends 364 of therotary blades 36 and rotates with therotary blades 36, increasing a sturdiness of the axial fan, such that operating noise of the axial fan is reduced. In addition, as therotary blades 36 extend from thehub 32 to theannular wall 38, length of therotary blade 36 along the extending direction increases, increasing airflow generated by the axial fan and correspondingly providing improved heat dissipation. -
FIG. 4 shows an alternative embodiment of the axial fan, differing from the previous embodiment in that aframe 48 is arranged around thebase 42. Theframe 48 is square, with anopening 43 defined in theframe 48 for airflow flowing therethrough. Thebase 42 is arranged at a center of the opening 43. Fourfixing portions 46 extend from the four corners of theframe 48, respectively, for fixing the axial fan to a heat sink for example. Threeribs 44 extend from an outer periphery to an inner periphery of theframe 48, along a tangential direction and evenly arranged along the circumferential direction of thebase 42. In addition, a guidingportion 581 extends outwardly and upwardly from atop side 582 of theannular wall 58. Atop edge 583 of the guidingportion 581 is higher than theend 560 of therotary blade 56, and abottom side 580 of theannular wall 58 is substantially at the same level as thedistal end 562 of theblade 56. The guidingportion 581 has a diameter gradually decreasing along the path of the airflow, concentrating the airflow onto therotor 50, and increasing speed thereof accordingly. - It is understood that the invention may be embodied in other forms without departing from the spirit thereof. Thus, the present examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.
Claims (12)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2008100683258A CN101619731B (en) | 2008-07-04 | 2008-07-04 | Cooling fan |
CN200810068325 | 2008-07-04 | ||
CN200810068325.8 | 2008-07-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20100003131A1 true US20100003131A1 (en) | 2010-01-07 |
US8092170B2 US8092170B2 (en) | 2012-01-10 |
Family
ID=41464527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/238,443 Expired - Fee Related US8092170B2 (en) | 2008-07-04 | 2008-09-26 | Axial fan |
Country Status (2)
Country | Link |
---|---|
US (1) | US8092170B2 (en) |
CN (1) | CN101619731B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI486526B (en) * | 2010-01-11 | 2015-06-01 | Foxconn Tech Co Ltd | Axial fan |
US20180003183A1 (en) * | 2013-12-04 | 2018-01-04 | Apple Inc. | Shrouded fan impeller with reduced cover overlap |
CN108443194A (en) * | 2018-06-22 | 2018-08-24 | 株洲联诚集团控股股份有限公司 | A kind of motor periphery formula inner flow passage propeller fan |
EP4202231A1 (en) * | 2021-12-27 | 2023-06-28 | Yen Sun Technology Corp. | Shock absorbing fan casing |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102135111B (en) * | 2010-01-22 | 2015-07-29 | 中山市云创知识产权服务有限公司 | Radiation fan and rotor thereof |
KR101386510B1 (en) * | 2012-10-31 | 2014-04-17 | 삼성전자주식회사 | Propeller fan and air conditioner having the same |
CN104100567B (en) * | 2013-04-10 | 2016-08-31 | 国基电子(上海)有限公司 | Radiator fan |
CN107218249A (en) * | 2017-08-01 | 2017-09-29 | 曹建礼 | Fan wheel Reinforced Hoop |
CN109864625B (en) * | 2017-12-05 | 2024-02-20 | 佛山市顺德区美的电热电器制造有限公司 | Axial fan, base subassembly and food processor |
TWI707088B (en) * | 2019-08-13 | 2020-10-11 | 大陸商昆山廣興電子有限公司 | Impeller |
CN117173844B (en) * | 2023-11-02 | 2024-03-08 | 南通美莱工业智能科技有限公司 | LED audible and visual alarm device with dampproofing function |
Citations (8)
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US4548548A (en) * | 1984-05-23 | 1985-10-22 | Airflow Research And Manufacturing Corp. | Fan and housing |
US5577888A (en) * | 1995-06-23 | 1996-11-26 | Siemens Electric Limited | High efficiency, low-noise, axial fan assembly |
US5927944A (en) * | 1997-05-30 | 1999-07-27 | Hewlett Packard Company | Fan with blades having integral rotating venturi |
US6045327A (en) * | 1998-05-04 | 2000-04-04 | Carrier Corporation | Axial flow fan assembly and one-piece housing for axial flow fan assembly |
US6481963B1 (en) * | 1999-09-03 | 2002-11-19 | Delta Electronics | Axial-flow fan having an air gap generation member |
US20020182071A1 (en) * | 2001-05-29 | 2002-12-05 | Belady Christian L. | Enhanced performance fan with the use of winglets |
US20070154308A1 (en) * | 2005-12-30 | 2007-07-05 | Sheng-An Yang | Heat-dissipating fan |
US7322792B2 (en) * | 2004-10-08 | 2008-01-29 | Asia Vital Component Co., Ltd. | Cooling fan without returning flow |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN2528992Y (en) * | 2001-12-25 | 2003-01-01 | 元山科技工业股份有限公司 | Low-noise electric fan |
CN2661966Y (en) * | 2003-10-31 | 2004-12-08 | 财团法人工业技术研究院 | Blade cladding axial flow heat radiating fan |
CN101008401A (en) | 2006-01-26 | 2007-08-01 | 赵汉高 | Combined type fan flabellum with low noise |
-
2008
- 2008-07-04 CN CN2008100683258A patent/CN101619731B/en not_active Expired - Fee Related
- 2008-09-26 US US12/238,443 patent/US8092170B2/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4548548A (en) * | 1984-05-23 | 1985-10-22 | Airflow Research And Manufacturing Corp. | Fan and housing |
US5577888A (en) * | 1995-06-23 | 1996-11-26 | Siemens Electric Limited | High efficiency, low-noise, axial fan assembly |
US5927944A (en) * | 1997-05-30 | 1999-07-27 | Hewlett Packard Company | Fan with blades having integral rotating venturi |
US6045327A (en) * | 1998-05-04 | 2000-04-04 | Carrier Corporation | Axial flow fan assembly and one-piece housing for axial flow fan assembly |
US6481963B1 (en) * | 1999-09-03 | 2002-11-19 | Delta Electronics | Axial-flow fan having an air gap generation member |
US20020182071A1 (en) * | 2001-05-29 | 2002-12-05 | Belady Christian L. | Enhanced performance fan with the use of winglets |
US7322792B2 (en) * | 2004-10-08 | 2008-01-29 | Asia Vital Component Co., Ltd. | Cooling fan without returning flow |
US20070154308A1 (en) * | 2005-12-30 | 2007-07-05 | Sheng-An Yang | Heat-dissipating fan |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI486526B (en) * | 2010-01-11 | 2015-06-01 | Foxconn Tech Co Ltd | Axial fan |
US20180003183A1 (en) * | 2013-12-04 | 2018-01-04 | Apple Inc. | Shrouded fan impeller with reduced cover overlap |
US10738787B2 (en) * | 2013-12-04 | 2020-08-11 | Apple Inc. | Shrouded fan impeller with reduced cover overlap |
CN108443194A (en) * | 2018-06-22 | 2018-08-24 | 株洲联诚集团控股股份有限公司 | A kind of motor periphery formula inner flow passage propeller fan |
EP4202231A1 (en) * | 2021-12-27 | 2023-06-28 | Yen Sun Technology Corp. | Shock absorbing fan casing |
Also Published As
Publication number | Publication date |
---|---|
US8092170B2 (en) | 2012-01-10 |
CN101619731A (en) | 2010-01-06 |
CN101619731B (en) | 2011-06-29 |
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Legal Events
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Owner name: FU ZHUN PRECISION INDUSTRY (SHEN ZHEN) CO., LTD., Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HWANG, CHING-BAI;ZHANG, JIE;REEL/FRAME:021588/0858 Effective date: 20080916 Owner name: FOXCONN TECHNOLOGY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HWANG, CHING-BAI;ZHANG, JIE;REEL/FRAME:021588/0858 Effective date: 20080916 |
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